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Unread 04-12-2012, 12:41 PM   #1
wellsb1
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1997 TJ Wrangler 
 
Join Date: Jan 2011
Location: Redford, Michigan
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Jeep TJ 4 cylinder Engine noise

Hello everyone. This one has me perplexed so I am hoping for some extra help
I have a 1997 TJ with the 2.5 4 cylinder, automatic. The Jeep runs great, no engine codes, but when the engine warms up, it sounds like a diesel engine and I cannot pipoint the source. Not the exhaust, not the catalytic converter, oil pressure is good, pulleys are all tight, water pump is new. Help!

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Unread 04-12-2012, 01:16 PM   #2
Line58
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1998 TJ Wrangler 
 
Join Date: Aug 2011
Location: Rio Rancho, New Mexico
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In other words, it sounds like a 16 year old 2.5L? Mine and many others sound the same. If you can find a cure to make it sound new again please let us know, however that unhealthy sound seems rather common.
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Unread 04-12-2012, 01:35 PM   #3
todd8888
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1997 TJ Wrangler 
 
Join Date: Nov 2009
Location: Fort Ann, NY
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Mine has 140,000 and does the same thing. Sounded like it was in the top so i changed the lifters (found 3 of them colapsed), but still makes the same noise after running about 5-10 minutes. If you find the cause let us know.
Mine also uses no oil, runs smooth, just sounds like a diesel.
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Unread 04-13-2012, 05:13 AM   #4
wellsb1
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1997 TJ Wrangler 
 
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Thanks foir the replies. That makes me feel a lot better as it does not sound good, but performs flawlessly.
Happy Jeeping everyone!
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Unread 04-13-2012, 07:15 AM   #5
tjsooner
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1998 TJ Wrangler 
 
Join Date: Mar 2009
Location: yukon, ok
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Mine had ticked for the 3 years I've had it. This Monday the ticking got much, much louder and the Jeep is in the shop now. Might need a rebuild or a new engine. Not sure what went but something bad happened. Never ran bad or overheated even once the loud ticking started.
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Unread 04-13-2012, 02:08 PM   #6
Dextreme
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1999 TJ Wrangler 
 
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A $5 Mechanics Stethoscope can help isolote the problem, especially if it is an exhaust manifold leak.

http://www.harborfreight.com/mechani...ope-41966.html
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Unread 04-13-2012, 09:31 PM   #7
Rio_Grande
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1997 TJ Wrangler 
 
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Location: IN
Posts: 179
Exaust manifold leaks are really common in these units. The back lower bolt often breaks off in the head.
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Unread 04-13-2012, 10:37 PM   #8
BucketOKarma
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2000 TJ Wrangler 
 
Join Date: Mar 2008
Location: Northfield CT
Posts: 257
Mine had a similar problem, found two separate places. One, my air intake was whistling, and second, the donut gasket between the manifold and down-pipe, was shot.
Now it sounds fine.

I hope that helps at least someone here....

... Although, I do have a ticking (like the "60 minutes" stopwatch), it's most prominent when in third gear under load (like getting on an on-ramp). It has me worried, but not enough to take it apart and possibly do more harm than good, or have someone else take it apart and have it do more harm to my wallet.
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